bootcamp partition vanished post ELC install...

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bootcamp partition vanished post ELC install...

adding to the few other threads out there with similar problems. I upgraded to ELC last night & when trying to boot into windows 10 this morning the partition is not viewable upon startup, within osx in finder, disk utility etc.

I found loner's thread with steps to verify if the partition is still 'there' and it looks like it is! 200gb under disk0.

If anyone could help with the exact steps to get the partition up and running again I could be eternally grateful! Please bear in mind i'm not excellent with terminal so please be patient 🙂

my mac is a late 2013 15" mbpr, 1 tb

last login: Sun Oct 4 10:30:33 on console

xxx's-MacBook-Pro:~ xxxxxxx$ diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage Macintosh HD 722.4 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 200.0 GB disk0s4

/dev/disk1 (internal, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD +722.0 GB disk1

Logical Volume on disk0s2

90E72F69-6D0C-44BC-A7F1-6ED91A1C0346

Unencrypted

xxx's-MacBook-Pro:~ xxxxxxxxx$ diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group F585876F-64D3-49A3-801E-5E439CD45282

=========================================================

Name: Macintosh HD

Status: Online

Size: 722414292992 B (722.4 GB)

Free Space: 18960384 B (19.0 MB)

|

+-< Physical Volume CEE23E49-27D1-47B1-8A7D-8461A02AB37D

| ----------------------------------------------------

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 722414292992 B (722.4 GB)

|

+-> Logical Volume Family B1192887-BAD7-477D-9812-0081F8056CA2

----------------------------------------------------------

Encryption Type: None

|

+-> Logical Volume 90E72F69-6D0C-44BC-A7F1-6ED91A1C0346

---------------------------------------------------

Disk: disk1

Status: Online

Size (Total): 722043011072 B (722.0 GB)

Revertible: Yes (no decryption required)

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

xxx's-MacBook-Pro:~ xxxxxxxx$ sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=1000555581440; sectorsize=512; blocks=1954210120

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 1954210119

start size index contents

0 1 MBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 1410965416 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

1411375056 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

1412644592 150941968

1563586560 390623232 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

1954209792 295

1954210087 32 Sec GPT table

1954210119 1 Sec GPT header

xxx's-MacBook-Pro:~ xxxxxxxxx$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 121643/255/63 [1954210120 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AC 1023 254 63 - 1023 254 63 [ 409640 - 1410965416] <Unknown ID>

3: AB 1023 254 63 - 1023 254 63 [1411375056 - 1269536] Darwin Boot

4: 0C 1023 254 63 - 1023 254 63 [1563586560 - 390623232] Win95 FAT32L

Posted on Oct 4, 2015 3:02 AM

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Answer 1

aeskrett Author

Level 1

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Oct 4, 2015 3:51 AM in response to aeskrett

after reading a little more i've downloaded testdisk and installed GPT Fdisk - i've reached the following screens on testdisk:

1.

and then 2.

please let me know how to proceed!

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Answer 2

aeskrett Author

Level 1

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Oct 4, 2015 4:46 AM in response to aeskrett

I pressed 'P' on the second 'MS Data' from the bottom and it gave me a list of familiar files from my bootcamp partition

not sure where to go from here?

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Answer 3

Loner T

Level 9

59,471 points

Oct 4, 2015 9:55 AM in response to aeskrett

Do you see System Volume Information if you scroll down?

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Answer 4

aeskrett Author

Level 1

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Oct 4, 2015 10:01 AM in response to Loner T

I actually got the bootcamp partition working again from reading your responses in some other threads. For recording purposes after my last step I did the following in GPT Fdisk:

Rebuild GPT4 using start/end offsets

Sudo gdisk /dev/rdisk0
P (print the full list of parts)
D (delete)
4 (part 4)
N (new part)
4 (part 4)
1412644864 - Start offset in bytes (start point for Bootcamp part)
+541564921(Size offset as opposed to End offset)
0700 (Windows part type)
P (print list of all parts just to see what changes will be made)
W (Write the new GPT)
Y (Yes! really write the new GPT)

This will delete and re-write the GPT partition info for /dev/disk0s4.

Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR.

Use defaults for other questions (like partition codes).

Sudo gdisk /dev/disk0
P (Print list of parts)
R (Recover)
H (chooses Hybrid)
Partitions numbers to be hybridized: 2 3 4
Y (Good for GRUB question)
N (part 2 boot flag)
N (part 3 boot flag)
Y (part 4 boot flag make NTFS bootable partition)
P (Print list of updated parts)
W (Write the new MBR)
Y (Yes! write the new MBR)
Reboot

Test 1 - Does Bootcamp Volume show up in Finder?

Test 2 - Can you see files in Bootcamp Volume?

Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?

Test 4 - If Test 3 is successful, select Bootcamp and Click Restart

Thank you so much for this information - osx and my win 10 partition are now fully working. You really should be given some compensation for this help. I would've lost a huge amount of unsaved data and had to reinstall everything again from scratch if this info wasn't out there. If you have a donation/patreon or something similar please let me know and i'll gladly help out in some way!

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Answer 5

Loner T

Level 9

59,471 points

Oct 4, 2015 10:42 AM in response to aeskrett

aeskrett wrote:

Thank you so much for this information - osx and my win 10 partition are now fully working. You really should be given some compensation for this help. I would've lost a huge amount of unsaved data and had to reinstall everything again from scratch if this info wasn't out there. If you have a donation/patreon or something similar please let me know and i'll gladly help out in some way!

Please backup your OS X and Windows and create System Restore points. Use separate physical disks, if possible. If you want to support the community, donate to the authors of the two tools you used (I have no affiliation to these authors 😉 ). Glad to see it working.

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